While hawking Breaking Dawn Part 2 in Australia this week, the 26-year-old Brit showed few inhibitions when it came to providing revealing tidbits about the couple's intimate onscreen moments for the Twilight saga's last outing.

"The sex scene in this one is pretty ridiculous," he tells The Kyle & Jackie O Show in Sydney. "It's just because you're kind of shooting stuff to be PG-13, and so it's just trying to think of inventive ways to try to make something sexy."

That wasn't the only challenge facing the duo: R.Pattz says that the pressures of delivering earth-shattering vampire sex can be pretty daunting.

"It also can't just be a normal sex scene," he adds. "It's supposed to be about, like, the greatest vampire sex you've ever had. So a lot of it was just closeups on me and Kristen's faces, but there was no one else there."

"You literally try and give a face of ecstasy...Guys' faces I don't think are really designed to do that," he quipped, adding that "the cameraman was laughing as well."

Although the Twilight twosome recently patched things up following her cheating scandal, they've been keeping separate promotional schedules: While Pattinson's been in Australia, Stewart, 22, has been stumping for the movie in Tokyo.

Expect that promo blitz to ramp up when the Twilight juggernaut begins its U.S. media onslaught in November with a slew of talk-show appearances by its stars.

Is it just a matter of time, then, before a reunited Robsten finally resurfaces to hawk the flick together?

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